PACCAR MX (2004 Emissions) Fault Code: P2239 Lambda – Current Too High on ECU (D420) Pin (C45)
PACCAR MX (2004 Emissions) Fault Code: P2239 Lambda – Current Too High on ECU (D420) Pin (C45)
SET CONDITIONS:
The PCI ECU (D420) detects a higher current than expected in the measuring circuit of the lambda sensor.
DIAGNOSTIC CONDITION:
The diagnostic runs continuously when the ignition is keyed on.
RESET CONDITION:
The DTC changes to inactive after the diagnostic runs and passes
POSSIBLE CAUSES:
1. Lambda sensor wiring issue
2. Lambda sensor failure
